Key points are not available for this paper at this time.
In this collection the editors' aim has been to concentrate on current and fundamental problems in movement, to stimulate interest by enabling the authors to put forward new ideas in a well-reasoned and coherent way. They have concentrated on two questions: 'Why move?' and 'What are the consequences?'. The book is thus not concerned with the mechanisms or with terminology but with the ultimate ecological and evolutionary principles of movement.
Dingle et al. (Fri,) studied this question.